21153741

素因数分解:

$3^1\times 7^2\times {\mathrm{151}}^1\times {\mathrm{953}}^1$

素因数の和:1121

約数の個数: 24

約数和(自身を含む): 33061824

約数和(自身を除く): 11908083

約数列:

[1, 3, 7, 21, 49, 147, 151, 453, 953, 1057, 2859, 3171, 6671, 7399, 20013, 22197, 46697, 140091, 143903, 431709, 1007321, 3021963, 7051247, 21153741]

約数ペア:

[(1, 21153741), (3, 7051247), (7, 3021963), (21, 1007321), (49, 431709), (147, 143903), (151, 140091), (453, 46697), (953, 22197), (1057, 20013), (2859, 7399), (3171, 6671)]